Real-mode programs freely execute CLI and STI to control interrupts, PUSHF and POPF to manipulate flags, INT n for DOS and BIOS calls, and IN/OUT for hardware I/O. In normal protected mode, these instructions are privilege-checked -- they execute normally if the caller has sufficient privilege, and fault otherwise. The 386 can't simply let V86 tasks execute them freely -- a DOS program disabling interrupts would bring down the whole system -- but trapping on every INT 21h call would make V86 impractically slow.
來到美國之後，關恆一直留了在紐約，送過外賣、開Uber、也開過卡車。剛開始的時候，他還未拿到給予尋求庇護者的工作許可證。，推荐阅读谷歌浏览器【最新下载地址】获取更多信息
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Фото: Maxim Shemetov / Reuters
Yellow: Coaching decisions